Balance puppet-valve



(No Mode1.)l

. A. WANIG'H,

BALANCE PUPPE/T VALVE.

No. 292.604. Y Patented -Jpngrzli884-- N. i'ErERsl PhowL'nhngnpmr. washington. D. c.

NITE@ f1 STATES ALEXANDER wANicH, or rHiLAnnLPHI, rnnfnsvnvania'."

BALANCE PuPPET-VALVE.

'SPECIFICATION forming part of Letters Patent No. 292,604, dated January 9, H84.

Application tiled April 10, 1853. (No model.) I

Be it known that I, ALEXANDER XVAMCH, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new'and useful Improvements in Balance Puppet-Valves; and the following is a speci'cation of my improvements, reference being had to the accompanying drawings, wherein- Figure 1 represents a central vertical section through a steam-chest provided with in?. let and exhaust valves embodying my invention, and Fig. 2 is ahorizontal section through such chest on the line x ,x of Fig. 1.

The present invention is an improvement upon the valve for which LettersPatent No. 113,600 were granted to me under dat-e of April 11, 187.1; and has for its objects the facilitating of the operation of the valve, and the affording of a means of relief against'back-pressure, whichlatter, under certain circumstances, may be caused by ingress of water. 4

In the drawings, A is the shell or casing of the steam-chest, whose interior is divided by partitions C G into three compartments, one of them, F, communicating by a port, S, with the boiler, another, E, by a similar port, S, with the exhaust-pipe, while the intermediate one, V, leads to the cylinder. The openings l l', by which communicationis effected between thc compartments, are beveled, as

shown, to form seats for the inlet and exhaust valves L L, respectively. As these valves are similar in construction a detailed 4descriptionr of one will suffice. Theinlet-valve L is cupshaped, as shown, and has a central opening, o, controlled bythe small pilot-valve P,whose stem N passes through a stuffing-box, R. A plate, M, is secured upon the valve L by means 'of screws n, passing down through. the legs m, and an opening is formed in the plate iWI just large enough to permit the free working of the stem N, but not the passage of the pilot-valve P.' Beneath the valve L is a table, K, Whose periphery fits closely'within the depending rim of the cup, and having vwings 7c, which serve as guides for the vertical movements thereof. The table K is mounted upon a stem, Q, which slides freely ina vertical direction in a socket within the standard I, cast upon or otherwise secured to the casing A. rlhe height of the table is such that when the valve L is closed down upon its seat `Z a small space is left between the top of the table and the adjacent flat bottom of the cup, while, as before stated, the contact between the periphery of the table and the depending rim of the cup is snug, though not absolutely steamtight. The table K has'an opening, vT, which receives the lower end of the valvestem N, and forms a guide therefor. The corresponding parts of the exhaust-valve L are indicated by the same letters of reference as those above given, but having a dash or prime mark to distinguish them. Thus in the exhaust-valve L the stem is lettered N', the pilot-valve P', the table K', &c. The valves are fitted in place and access to them is had through openings in the top ot' the steam-chest, which areclosed by means of the covers D D', secured by screw-nuts d d.

The operation of the valves is r`as follows:

compartment F intothe central compartment V, the small pilot-valve P is raised slightly, and the steam rushes into the `space between the top of the table K and bottom of the cup L, thus nearly equalizing the pressure on both sides of the latter, the only access upon the outside being an amount which corresponds to the area of cross-section of the depending rim. The continued upward movement of the pilotvalvel) brings it in contact with the plate M, by means of which it readily lifts the nearly balanced valve L from its seat l, thus permittingthe inlet of steam into the chamber-V and cylinder. The reverse movement of the pilotvalve P .closes the valve L, andthe exhaust from the chamber V into the chamber E is efA fected by raising the stem N of thepilot-valve lactly similar to that described in the case of which has to `be filled on the openingiof the pilot-valve to effect .the balancing of the main valve renders the operation very rapid. If, as sometimes occurs under conditions where these valves are used, an excessive back-pressure takes place in the cylinder or chambers, to which it leads from the rise of Water therein, its pressure is automatically relieved by the rise of the'table K from its seat in the standard I, the valve being lifted along with it, and thus all danger of fracture is prevented.

F', when a series of operations takes place eX-p the inlet-valve. rlhe comparatively sn'iall space l Vhen it is desired to admit steam from'the IOO Having thus described my invention, what table K, provided with the stem Q, andthe I claim as new, and desire to secure by Letters standard I, provided with :L socket, whereby 1o Patent, isthe table is permitted to move vertically, sub- 1. The combination, with the cup-shaped stantiay as and for the purposes set forth.

5 valve L and its pilot-valve, of a table arranged ALEXANDER VANICH.

Within said valve L, substantially in the man- VitneSSQS: 11er set forth. WM. H. MYERS,

2. The combination, with the valve L, of the J. XVA LTER DOUG mss. 

